GENERALIZED FIELD MODELS FOR LEPTONS AND BARYONS Article Chakrabarti S. Solitons and nonlinear systems. South Asian Pub., New Delhi. 1986. P. 159-166
GROUP-THEORETIC METHODS IN PHYSICS, VOL. 2 (RUSSIAN) (JŪRMALA, 1985) Conference proceedings "Nauka", Moscow.
SET-VALUED ANALYSIS AND DIFFERENTIAL INCLUSIONS (PAMPOROVO, 1990) Conference proceedings Birkhäuser Boston, Boston, MA.